chore: factor out SceneManager_ methods

thermion_dart/native/include/APIExport.h

@@ -0,0 +1,47 @@
+#ifndef _API_EXPORT_H
+#define _API_EXPORT_H
+#ifdef _WIN32
+#ifdef IS_DLL
+#define EMSCRIPTEN_KEEPALIVE __declspec(dllimport)
+#else
+#define EMSCRIPTEN_KEEPALIVE __declspec(dllexport)
+#endif
+#else
+#ifndef EMSCRIPTEN_KEEPALIVE
+#define EMSCRIPTEN_KEEPALIVE __attribute__((visibility("default")))
+#endif
+#endif
+
+// we copy the LLVM <stdbool.h> here rather than including,
+// because on Windows it's difficult to pin the exact location which confuses dart ffigen
+
+#ifndef __STDBOOL_H
+#define __STDBOOL_H
+
+#define __bool_true_false_are_defined 1
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+/* FIXME: We should be issuing a deprecation warning here, but cannot yet due
+ * to system headers which include this header file unconditionally.
+ */
+#elif !defined(__cplusplus)
+#define bool _Bool
+#define true 1
+#define false 0
+#elif defined(__GNUC__) && !defined(__STRICT_ANSI__)
+/* Define _Bool as a GNU extension. */
+#define _Bool bool
+#if defined(__cplusplus) && __cplusplus < 201103L
+/* For C++98, define bool, false, true as a GNU extension. */
+#define bool bool
+#define false false
+#define true true
+#endif
+#endif
+
+#endif /* __STDBOOL_H */
+
+#if defined(__APPLE__) || defined(__EMSCRIPTEN__)
+#include <stddef.h>
+#endif
+#endif